Rachel simulated yield output
From GOSIA
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| - | ''This page | + | ''This page uses the output of Rachel version 2.0.8 beta.'' |
| - | The output to the terminal | + | The output to the terminal from a "simulated yields" calculation has the following format: |
<pre> | <pre> | ||
| - | Experiment 1 Detector | + | Experiment 1 Detector 2 |
| - | Raw | + | Raw Count Gamma **Est. intr. "Corrected" |
| - | Band Spin Band Spin | + | Band Spin Band Spin *Counts Error Rate(Hz) E(keV) effic.(1) ***Counts Error |
| - | -------------------------------------------------------------------------------------------------------- | + | ---------------------------------------------------------------------------------------------------------------- |
| - | gsb 6.0 gsb | + | gsb 18.0 gsb 16.0 864 29 0.002001 686.0 0.271 3266 198 |
| - | gsb 4.0 gsb 2.0 | + | gsb 16.0 gsb 14.0 21056 145 0.048741 658.7 0.277 78074 3941 |
| - | gsb 2.0 gsb 0.0 | + | gsb 14.0 gsb 12.0 400895 633 0.927999 626.6 0.284 1360201 68044 |
| + | gsb 12.0 gsb 10.0 5914064 2432 13.689963 579.7 0.296 21145020 1057287 | ||
| + | gsb 10.0 gsb 8.0 65755367 8109 152.21149 512.4 0.315 211214415 10560753 | ||
| + | gsb 8.0 gsb 6.0 527950313 22977 1222.1072 426.3 0.343 1470121661 73506111 | ||
| + | gsb 6.0 gsb 4.0 2866371774 53539 6635.1198 325.6 0.379 7435917854 371795919 | ||
| + | gsb 4.0 gsb 2.0 8174712130 90414 18922.944 213.5 0.382 21045773464 1052288699 | ||
| + | gsb 2.0 gsb 0.0 706191594 26574 1634.7027 93.3 0.078 8631491935 431574719 | ||
</pre> | </pre> | ||
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| - | * The " | + | * The "Corrected Counts" column gives the true particle-gamma count emitted into the solid angles of the particle and Ge detectors. This is equivalent to the total counts for the beam run if the detectors were blackbodies (had 100% efficiency), or if the raw counts were corrected for the absolute p-gamma efficiency. |
* The "Raw Counts" column is only used in this output and is not passed to Gosia. The raw counts are the estimated p-gamma counts in the raw data, assuming an approximate absolute efficiency for Gammasphere. | * The "Raw Counts" column is only used in this output and is not passed to Gosia. The raw counts are the estimated p-gamma counts in the raw data, assuming an approximate absolute efficiency for Gammasphere. | ||
| - | * The " | + | * The "Est. intr. effic." column gives the ''assumed'' absolute ''intrinsic'' efficiency <math>(\epsilon_{intr})</math> of the Ge detector used to calculate the value in the "Raw counts" column. For example, at 1333 keV, Gammasphere typically has an absolute efficiency of 9% for 100 installed detectors. Since the solid angle coverage of these 100 detectors is ~6.1 sr, the ''intrinsic'' efficiency is <math>~9% * 4 * \pi / 6.1 = 18.5%</math>. |
| - | + | ===Estimating count rates in a planned experiment=== | |
| - | Before the | + | Since the "Corrected counts" column gives the absolute emitted particle-gamma counts into the particle- and gamma-detector solid angles (for 100% efficiency), these values can be combined with better known values of the particle and gamma efficiencies to predict more accurate "raw" count rates. |
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| + | ===Simulated data passed to Gosia=== | ||
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| + | Note that the "Corrected Counts" are not sent to Gosia as they appear in the table. | ||
| + | |||
| + | Before the corrected counts are sent to Gosia they are divided by the solid angle of each Ge detector to match Gosia's calculation of yield per unit solid angle. (This is true in Rachel versions >= 2.0.7.beta; in earlier versions this solid angle factor was neglected.) All yields sent to Gosia are then multiplied by <math>4\pi</math> so that weak transitions have counts >=1. This overall multiplicative constant of <math>4\pi</math> has no effect on fitting. Refer to the page [[Normalization_of_yield_data | Normalization of yield data]] for more detail. | ||
